provide a novel perfluorodioxole which is suitable for producing a homopolymer and a copolymer both having excellent mechanical properties and a good thermal stability.
CONSTITUTION: A perfluorodioxole of formula I (wherein RF is 1-5C perfluoroalkyl; and X1 and X2 are each F or CF3) (e.g. 2,2,4-trifluoro-5- trifluoromethoxy-1,3-dioxole of formula II) is provided, which is obtd. e.g. by reacting a dioxole of formula III with a fluorooxy compd. of the formula: RFOF and reacting the resultant dioxolane of formula IV with a metal in a dipolar aprotic solvent to dehalogenate the dioxolane of formula IV or by reacting a compd. of formula V with a bisflurooxy compd. of formula VI at -140 to -20°C and dehalogenating the resultant dioxolane of formula IV in the same way as above. The perfluorodioxole of formula I may be homopolymerized or copolymerized with an olefinically unsatd. comonomer.

provide a novel perfluorodioxole which is suitable for producing a homopolymer and a copolymer both having excellent mechanical properties and a good thermal stability.
CONSTITUTION: A perfluorodioxole of formula I (wherein RF is 1-5C perfluoroalkyl; and X1 and X2 are each F or CF3) (e.g. 2,2,4-trifluoro-5- trifluoromethoxy-1,3-dioxole of formula II) is provided, which is obtd. e.g. by reacting a dioxole of formula III with a fluorooxy compd. of the formula: RFOF and reacting the resultant dioxolane of formula IV with a metal in a dipolar aprotic solvent to dehalogenate the dioxolane of formula IV or by reacting a compd. of formula V with a bisflurooxy compd. of formula VI at -140 to -20°C and dehalogenating the resultant dioxolane of formula IV in the same way as above. The perfluorodioxole of formula I may be homopolymerized or copolymerized with an olefinically unsatd. comonomer.